Canon 5D MK II - aliasing problem.

L

Lee Wilson

Veteran
Anyone got any views on the 5D's aliasing issue ?

I would hope it is down to a less than ideal implementation of the aliasing software in the pre-production models.

Go here . . .

http://www.dpreview.com/previews/canoneos5dmarkii/page15.asp

. . . and download Sample Video 2

The clearest examples of the issue can be seen on the base of the train as it goes over the bridge and on the fine mesh grill at the end of the shot in the upper left of the frame.

I am not sure what part settings like 'sharpness' and so on might contribute to this ?
 
It really looks like testers are only shooting on the default "contrasty sharpie" setting.

That train is bizarre, not only aliased and jaggy, but there is some weird thing there that looks like zebras... very strange area....

Get slicing!
(Kidding, this would probably take about a billion cuts/layers in AE)


Those two samples are the most disheartening yet...
 
Matthew Bennett said:
It really looks like testers are only shooting on the default "contrasty sharpie" setting.
Click to expand...

Yeah, possibly.

Matthew Bennett said:
That train is bizarre, not only aliased and jaggy, but there is some weird thing there that looks like zebras... very strange area....
Click to expand...

Those trains have a grill - (I know those trains / that street it's 10 minutes from where I live) - running along the base where the zebra/alias/colour stuff is happening, I expect that is causing moiré when squeezed through whatever downsampling they are using - and the aliasing filters are not doing a great job at handling it.

Matthew Bennett said:
Those two samples are the most disheartening yet...
Click to expand...


Agreed, I could shoot that street and get a better frame with a naked (no adaptor) HV20.
 
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Seems like everything in London is designed to beat video DSLR's to a fine pulp... I just downloaded a d90 bus clip from DPreview (shot in London) and it destroyed the LEE FIX... but it was almost exclusively composed of fine moired slightly off-horizontal grills and lines moving through the frame at speed.
 
Matthew Bennett said:
Seems like everything in London is designed to beat video DSLR's to a fine pulp... I just downloaded a d90 bus clip from DPreview (shot in London) and it destroyed the LEE FIX... but it was almost exclusively composed of fine moired slightly off-horizontal grills and lines moving through the frame at speed.
Click to expand...

Fine repeating patterned areas seem to be something to avoid on the current first wave of movie shooting DSLRs - until a manufacturer has the CPU power in a camera to downsample the whole frame without binning then this is likely to be an ongoing issue.

I like the 'LEE FIX' makes me sound famous, I think I might get my hair cut this weekend and get that white suit out of the cleaners, you know, autographs and all that . . . .
 
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